Fail with CURL PUT call with Zoho Subscription API using PHP

Hello

I use the API provided by zoho in subscription and forms for my application. I got no problems for retreive any information and update my custormer data in Zoho Books but unfortunatly, that' not working for subscription.

This is my json array to update a subscription with a new addon

{
"reference_id": "",
"plan": {
"plan_code": "MyDWS-FR-Basic",
"name": "Abonnement de base",
"price": 0,
"quantity": 1,
"tax_id": "",
"setup_fee_tax_id": ""
},
"addons": [{
"addon_code": "ADD_EN-Others1",
"price": 0,
"quantity": 1,
"tax_id": ""
}],
"contactpersons": [{
"contactperson_id": "264809000000126115"
}]
}

This is my call in my PHP app

public function makePuTCurlQuery($query,$data){

    $curl = curl_init($query);

    curl_setopt_array($curl, array(
        CURLOPT_POST => 1,
        CURLOPT_CUSTOMREQUEST => "PUT",
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_RETURNTRANSFER => true
    ));

    $response = curl_exec($curl);
    curl_close($ch);
    return $response;
}

Content of my variables :

$query > https://subscriptions.zoho.com/api/v1/subscriptions/My_working_subscription_id

$data >

array(3) {
	["authtoken"]=>
	string(32) "my_working_authtoken"
	["organization_id"]=>
	string(9) "my_working_organization_id"
	["JSONString"]=>
	string(281) "{"reference_id":"","plan":{"plan_code":"MyDWS-FR-Basic","name":"Abonnement de base","price":0,"quantity":1,"tax_id":"","setup_fee_tax_id":""},"addons":[{"addon_code":"ADD_EN-Others1","price":0,"quantity":1,"tax_id":""}],"contactpersons":[{"contactperson_id":"264809000000126115"}]}"
	}

This is the result of the call with any others explaination > "The request passed is not valid."

Where i did a mistake ? This kind of call working like a charm for Books...

Cheers

Sébastien

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